Data points: 93
Model compare
The readout for GPT-4 Turbo and GPT-5.1, before the detailed comparison sheet.
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 24 to 76.
Evidence depth
93 data points
Includes 14 benchmark rows, 0 audit samples, and 6 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 20 high-signal samples across speed, scores, and audit health.
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
This report only uses LMSpeed data for GPT-4 Turbo and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 24.0 pts | 76.0 pts |
| Benchmark category leads | 1 categories | 3 categories |
| Operational advantages | First-token latency | Cheapest input price, Average speed, Free providers, Provider coverage |
| Context window | 128K tokens | 400K tokens |
| Max output | 4.1K tokens | 128K tokens |
| Modalities | Input TextImage Output Text |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
| Model compare | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Apr 2024 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2023-12-31 | No data |
| OpenRouter ID | openai/gpt-4-turbo | openai/gpt-5.1 |
| References | No data | No data |
This report only uses LMSpeed data for GPT-4 Turbo and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4 Turbo
GPT-4 Turbo is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency).
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
Avg. score
GPT-4 Turbo
47
Avg. score
GPT-5.1
52.1
GPT-5.1
GPT-5.1 leads by 5.4
GPT-5.1 leads by 9.2
GPT-4 Turbo leads by 0.6
GPT-5.1 leads by 8.3
No data
No data
GPT-5.1
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-4 Turbo
winner1.25 s
Rank #48/136 · confidence 4
GPT-5.1
35.90 s
Rank #113/136 · confidence 4
GPT-4 Turbo
39.4 tok/s
Rank #130/136 · confidence 4
GPT-5.1
winner111.6 tok/s
Rank #60/136 · confidence 4
GPT-4 Turbo
winner1.25 s
Rank #81/136 · confidence 4
GPT-5.1
35.90 s
Rank #128/136 · confidence 4
GPT-4 Turbo
$10.00/M
Rank #153/162 · confidence 4
GPT-5.1
winner$1.25/M
Rank #108/162 · confidence 4
GPT-4 Turbo
$15.00/M
Rank #153/162 · confidence 4
GPT-5.1
winner$3.44/M
Rank #118/162 · confidence 4
GPT-4 Turbo
$30.00/M
Rank #151/162 · confidence 4
GPT-5.1
winner$10.00/M
Rank #121/162 · confidence 4
GPT-4 Turbo
69.4%
Rank #103/125 · confidence 4
GPT-5.1
winner87.0%
Rank #12/125 · confidence 4
GPT-4 Turbo
3.3%
Rank #179/186 · confidence 4
GPT-5.1
winner26.5%
Rank #39/186 · confidence 4
GPT-4 Turbo
29.1%
Rank #91/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GPT-4 Turbo
21.5
Rank #50/58 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner49.4
Rank #32/58 · confidence 1 · eval date 2025-11-13
GPT-4 Turbo
31.9%
Rank #127/184 · confidence 4
GPT-5.1
winner43.3%
Rank #41/184 · confidence 4
GPT-4 Turbo
31.9
Rank #84/96 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner43.3
Rank #45/96 · confidence 1 · eval date 2025-11-13
GPT-4 Turbo
3.3
Rank #94/96 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner26.5
Rank #39/96 · confidence 1 · eval date 2025-11-13
GPT-4 Turbo
7.9
Rank #96/99 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner36.9
Rank #42/99 · confidence 1 · eval date 2025-11-13
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
10 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data |
5 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
5 tests | GPT-4 Turbo speed / latency 73 tok/s / 1218ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
0 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
GPT-4 Turbo gpt-4-turbo speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1 speed / latency No data input / output $0/request |
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Input
Output
| Features | Text inputImage inputText outputTool callingStructured outputsJSON mode | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
|---|
